Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Supplemental Information (Details Textuals) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009	Sep. 30, 2011 Minimum [Member] Mortgage Repurchase Liability [Member]	Sep. 30, 2011 Maximum [Member] Mortgage Repurchase Liability [Member]	Sep. 30, 2011 Mortgage Repurchase Liability [Member]	Dec. 31, 2010 Mortgage Repurchase Liability [Member]	Sep. 30, 2011 Mortgage Repurchase Liability [Member]	Jun. 30, 2011 Mortgage Repurchase Liability [Member]	Dec. 31, 2010 Mortgage Repurchase Liability [Member]	Sep. 30, 2010 Mortgage Repurchase Liability [Member]	Jun. 30, 2010 Mortgage Repurchase Liability [Member]	Dec. 31, 2009 Mortgage Repurchase Liability [Member]	Sep. 30, 2011 Standby Letters of Credit, and Other Financial Guarantees [Member] Other Unfunded Commitments to Extend Credit	Dec. 31, 2010 Standby Letters of Credit, and Other Financial Guarantees [Member] Other Unfunded Commitments to Extend Credit	Sep. 30, 2011 Other Guarantees and Commitments Letters of Credit Hedged By Derivative Transactions	Dec. 31, 2010 Other Guarantees and Commitments Letters of Credit Hedged By Derivative Transactions	Sep. 30, 2011 Other Unfunded Commitments to Extend Credit	Dec. 31, 2010 Other Unfunded Commitments to Extend Credit	Sep. 30, 2011 Securities Lending Indemnifications [Member]	Dec. 31, 2010 Securities Lending Indemnifications [Member]	Sep. 30, 2011 Derivative Qualifying as Guarantees [Member]	Dec. 31, 2010 Derivative Qualifying as Guarantees [Member]	Sep. 30, 2011 Other Guarantees and Commitments	Dec. 31, 2010 Other Guarantees and Commitments	Sep. 30, 2011 Standby Letters of Credit, and Other Financial Guarantees [Member]	Dec. 31, 2010 Standby Letters of Credit, and Other Financial Guarantees [Member]	Sep. 30, 2011 Other letters of credit	Dec. 31, 2010 Other letters of credit	Sep. 30, 2011 Standby and Other Letters of Credit [Member]	Dec. 31, 2010 Standby and Other Letters of Credit [Member]	Sep. 30, 2011 Loans Sold With Recourse [Member]	Dec. 31, 2010 Loans Sold With Recourse [Member]
Off-balance sheet lending related-financial instruments, guarantees and other commitments (Numeric) [Abstract]
Contractual amount net of risk participations for other unfunded commitments to extend credit																			$ 617,000,000	$ 542,000,000
Contractual amount net of risk participations for standby letters of credit and other financial guarantees																											21,200,000,000	22,400,000,000
Contractual amount net of risk participations for other letters of credit																													1,400,000,000	1,100,000,000
Unissued standly letters of credit commitments	43,000,000,000	41,600,000,000
Collateral held relating to standby letters of credit																											40,715,000,000	37,815,000,000
Collateral held relating to other letters of credit																													1,468,000,000	2,127,000,000
Collateral held in support of securities lending indemnification agreements																					200,800,000,000	185,000,000,000
Derivatives qualifying as guarantees payables																							823,000,000	390,000,000
Derivatives qualifying as guarantees receivables																							105,000,000	96,000,000
Unfunded commitments to third-party private equity funds	853,000,000	1,000,000,000
Unfunded commitments for other equity investments	1,400,000,000	1,400,000,000
Investments that are generally fair valued at net asset value	790,000,000	1,000,000,000
Commitments related to leveraged and acquisition finance activities	7,100,000,000	5,900,000,000
Standby and other letters of credit carrying values																															693,000,000	707,000,000
Standby and other letters of credit allowance for lending-related commitments																															314,000,000	347,000,000
Standby and other letters of credit fair value of the guarantee liability																															379,000,000	360,000,000
Notional value of the derivatives deemed to be guarantees																							81,200,000,000	87,800,000,000
Notional amount on stable value contracts	25,900,000,000	25,900,000,000
Maximum exposure to loss on derivatives	2,800,000,000	2,700,000,000
Unsettled reverse repurchase and securities borrowing agreements with regular way settlement periods	20,400,000,000	14,400,000,000
Unsettled forward starting reverse repurchase and securities borrowing agreements	49,300,000,000	25,500,000,000
Unpaid principal balance of loans sold with recourse																																	10,600,000,000	11,000,000,000
Carrying value																																	155,000,000	153,000,000
Credit enhancements and bond and commercial paper liquidity commitments															48,500,000,000	43,400,000,000
Loss Contingency Range of Possible Loss Portion, Minimum					0	2,000,000,000
Allowance for lending-related commitments	686,000,000	717,000,000	873,000,000	939,000,000			3,616,000,000	3,285,000,000	3,616,000,000	3,631,000,000	3,285,000,000	3,307,000,000	2,332,000,000	1,705,000,000													312,000,000	345,000,000	2,000,000	2,000,000			155,000,000	153,000,000
Percentage of decline in home prices assumption	45.00%
Percentage of decline in home prices assumption beyond the Firm's current assumptions	10.00%
Contractual amount																	$ 3,900,000,000	$ 3,800,000,000			$ 199,020,000,000	$ 181,717,000,000	$ 81,243,000,000	$ 87,768,000,000	$ 6,113,000,000	$ 6,492,000,000							$ 10,615,000,000	$ 10,982,000,000